Question

The angle between the area and area vector is..........
[a] zero
[b] π/ 2
(c) π

From the chapter 'Electric Flux and Guass's Law'
physics ​

Answer 1

Electric flux is zero

because it is perpendicular

Answer 2

"π"

Explanation:

The correct answer is option c i.e. π.

The following is the explanation:

Considering that, A × B =B ×A

We realize that,

A ×B =−B ×A

• (A ×B )⋅(B×A ) which equals to (A ×B )⋅(−A ×B )
• ∣ A× B∣∣ B× A|cosθ which equals to −( A× B)⋅( A × B )

∣ A × B ∣^ 2 cosθ=−∣ A × B ∣ ^2

• cosθ=−1
• cosθ=cosπ
• therefore  θ=π

Thus, the point between

A ×B furthermore B ×A is π